murphy



P. W. MURPHY.

INTERNAL GOMBUSTIONENGINE.

APPLICATION FILED FEB. 10, 1919.

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INTERNAL COMBUSTION ENGINE.

APPLICATION FILED F'E8.1o,1919.

1,389,967, PatentedSept. 6, 1921.

2 SHEETS-SHEET 2.v

UNITED STATES PATENT oFFlcE.

PETER W. MURPHY, OF CHICAGO, ILLINOIS,r ASSIGNOR TO MURPHY ENGINEERING COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION 0F MICHIGAN.

INTERNAL-COMBUSTION ENGINE.

Specicaton of Letters Patent.

Patented sept. 6, 1921.

Application led February 10, 1919. Serial No. 276,193.

To all' lwhom t may concern:

Be it known that I, PETER IV. MURPHY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Internal-Combustion Engines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to internal combustion engines and has to do more particularly with that type of engine in which a series of cylinders and pistons are circularly disposed around the .main shaft and in which the pistons reciprocate parallel to the axis of the main shaft. One of the features of my invention is the provision of a cylinderhead, carrying intake and exhaust puppet valvesfor each of the cylinders and in which a valve chamber is provided and so flared out or enlarged that valves of large diame-y ters may be used. Another feature of my invention is that the-cylinder head with its enlarged valve chamber is so constructed that the valves, although their total diameter is substantially the same or greater than that of the cylinder, may be readily removed from the cylinder head. Another advantage of my improved construction is that the valves may be disposed with their stems parallel to the main shaft, instead of being at an angle as in former engines, so that clearance between the valve head and the cylinder is reduced to a minimum. Another feature of my invention is the provision of a valve construction in which the valve stems are disposed parallel to the main shaft with tappets disposed perpendicular to the shaft and operated by peripherally faced cams, with rocker arms in the shape of bell-crank levers disposed between the tappets and the valve stems for operating the valve.

For a better understanding of my invention reference is to be had to the accompanying drawings in Which- Figure 1 is a longitudinal section through an internal combustion engine having my invention applied thereto; and

Fig. 2 is an enlarged end view of one end Y cam 4 which is acted upon by a plurality of circu'larly disposed pistons 5 connected through a piston rod 6 to a slide 7 carry` ing rollers 8 tov act upon opposed faces of the cam 4 to rotate the shaft 3. As shown in Fig. 2 there are ten cylinders for each end of the engine but of course, my inven-v tion is not limited to any particular num# ber of cylinders.

A cylinderhead is provided carrying intake valves 9 and exhaust valves 10, having their stems disposed parallel tothe axis of the main shaft andsuitably supported in the cylinder head. In engines ofthis type it is desirable to have Valve heads of comparatively large diameter so that the intake and exhaust may be accomplished with a shorter movement of the valve, or a larger volume of intake or exhaust area provided with a movement of the valves the same as Where valves of smaller diameter are used..

11 of minimum clearance, and preferably split the cylinder head at 12, the part 13 of the cylinder head adjacent to the cylinder being flared out from the cylinder While the chamber in the valve carrying part 14 of the cylinder head is straight so as to permit Withdrawal of the valves 9, 10. It Will be apparent that although the total diameter of the valve heads is greater than the diameter of the cylinder,yby means of my improved construction the valve heads are set in parallel planes and furthermore a valve chamber of minimum clearance is provided at the same time permitting ready removal of the valve.

New in order to operate the valves I provide operating mechanism which permits of the use of a peripherally faced cam as distinguished from the side faced and more eX- pensive cam heretofore used. In the preferred form I provide an intake cam 15 and exhaust cam 16 suitably fastened to the main shaft 3, the exhaust cam being in lead of the inlet cam as shown in Fig.. 2. These cams, 15 and 16, operate upon tappets 17, 18 suitably supported in the cylinder head and carry rollers which are in engagement with the cam surfaces. I also provide intermediately disposed rocker arms in the shape of bell-crank le-vers 19, 2O suitably supported upon thelcylinder head and carrying adjusting means in the form of threaded studs 2l, 22 adapted for properly positioning the rocker arms relative to the tappets and valve stems.

In the form of engine illustrated herein it is to be understood that there is a series of cylinders and a corresponding cylinder head. carrie-d upon each end of the central casing 23, each end being of substantially the same construction.

In the operation of the engine shown herein the pistons 5, which are oppositely connected to the roller slides 7, act upon the cam 4 to rotate the shaft 3. The rotation of this yshaft of course operates the intake and exhaust valves 9 and i0 respectively of the various cylinders by means of the cams l5 and land the intermediately disposed tappets and rocker arms.

An intake 24 is shown leading into the intake manifold 25 which is circularly disposed around the main shaft and connected to the various intake valves 9. Thus as the various valves 9 are operated, gas is drawn into the cylinders and thereafter exhausted out into the atmosphere through the exhaust valves l() and exhaust opening 26.

Vhat I claim as new and desire to secure by U. S. Letters Patent is:

1.'In an internahcombustion engine, a main shaft, cylinders and pistons disposed around the shaft and parallel thereto, a cylinder head for said cylinders, intake and exhause puppet valves parallel with the shaft carried by the cylinder head for each cylinder, peripherally faced cams axially alined withthe main shaft, and rocker arms connecting each of said cams and each set of said valves.

2. In an internal combustion engine, a rotatable main shaft, cylinders and pistons disposed around the shaft and parallel thereto, a cylinder head for said cylinders, intake and exhaust puppetfvalves carried by the cylinder head for each cylinder and having valve stems substantially parallel to the axis of the main shaft, peripherally faced cams axially alined with the main shaft, and rocker arms connecting the cams and valves, there being a single cam for all of the intake valves and a single cam for all of the exhaust valves.

3. In an internal combustion engine, a rotatable main shaft, cylinders and pistons disposed around the shaft and parallel thereto, a cylinder head for said cylinders, intake and exhaust puppet valves carried by the cylinder head for each cylinder and having valve stems substantially parallel tothe axis ofthe main shaft, peripherally faced cams axially alined with the main shaft, tappets operated by theY cams and bell-crank rocker arms connecting eachof said cams and each set of said valves.

4. In an internal combustion engine, a main shaft, cylinders and pistons disposed around said shaft and parallel thereto, an intake and an exhaust valve for each cylinder the total diameter of the heads of which is at least substantially that of the piston, a cylinder head supporting said valves with their heads adjacent the corresponding ends of the cylinders, and a split valve chamber for each cylinder enlarged or flared out wider than the outei' edges of the valves and split to permit ready withdrawal thereof through the valve chamber.

5. In an internal combustion engine, a main shaft, cylinders and pistons disposed around said shaft and parallel thereto, an intake and an exhaust valve for each cylinder the total diameter of the heads of which is at least substantially that of the piston, a cylinder head supporting said valves with their heads adjacent the corresponding end of the cylinder, valve chambers in the cylinder head extending to the outer edge of each pair of valves, and larger than the piston diameter so as to permit removal of the valves, and converging sides extending from Said edges of the valve chambers to the edge of the cylinder.

(l. In an internal combustion engine, a main shaft, a series of cylinders and pistons disposed around theshaft and parallel thereto, an intake and exhaust valve for each cylinder having valve heads setting in the same plane and whose total diameter is greater' than that of the piston, each pair of valve-heads being in the saine plane parallel to the cylinder end and adjacent thereto, a cylinder head supporting the valves, valve chambers in the cylinder head each extending beyond the outer edges of each pair of valves, and an intermediate member disposed between the cylinder end and cylinder head and having converging walled chambers connecting the cylinder head valve chambers and cylinders.

7. In an internal combustion engine, a rotatable main shaft, cylinders and pist-ons disposed around the shaft, an outer row of valves disposed around the shaft, an inner row of valves disposed around the shaft, a peripherally faced cam for each rovi7 of valves connected with the shaft, and rocker arms each connecting a. cam and valve, said cams being mounted on the shaft and rotatable therewith.

In witness whereof, I hereunto subscribe my name/this 30th day of eptember, A. D.

PETER IV. MURPHY. 

